Display Limit for Highlights in Roblox Engine: Is There a Cap?

Hello, I am currently working on an ESP, and I would like to have one Highlight on each part of the body to check if the target is touchable. However, it seems to be limited to a few characters, even though every character has a Highlight. I wonder if the Roblox engine imposes a limit on the display of Highlights. If so, is there a way to bypass this limitation?

Your ideas or solutions would be greatly appreciated!